Daikin REYQ32M7W1B [29/32] Refnet pipe selection
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Daikin REYQ32M7W1B [29/32] Refnet pipe selection

Daikin REYQ42M7W1B [29/32] Refnet pipe selection
• Selection procedure
4
• Systems • Selection procedure
28
5 REFNET pipe selection
5-1 RX(Y)Q5-10M7W1B, RXYQ12-48M7W1B
Example of connection
(Connection of 8 indoor units Heat pump system)
One outdoor
unit installed
(RXYQ5~16)
H2
H1
H1
H3
a b c d e f g
c d e f g h
c d e f g h
A B C
D E F
G
h i j k
l m n
1 2 3
4 5 6
7
1 2 3 4
5 6
1 2 3 4
5 6
7 8
c d e f g h
1 2 3 4
5 6 7
8
b c d e f g h
1 2 3 4
5 6 7
8
7 8
8
P
H2
a b c d e f g
A B C
D E F
G
h i j k
l m n
1 2 3 4
5 6 7
8
P
Outdoor unit
REFNET joint (A-G)
Indoor units (1-8)
H1
H1
H2
H2
aa
i
b
a
i
b
Outdoor unit
Outdoor unit
REFNET joint (A • B)
Indoor units (1-8)
Indoor units (1-8)
REFNET header
REFNET header
k
j
k
j
H1
H2
H2
Outdoor unit
REFNET header
Indoor units (1-8)
H3
Indoor units (1-8)
Outdoor unit
REFNET joint (A-G)
REFNET joint (A • B)
First outdoor
branch
H1
H3
a
Outdoor unit
REFNET header
Indoor units (1-8)
When multiple
outdoor units are
installed
(RXYQ18~)
* If the system capacity is RXYQ18 or more, re-read to
the first outdoor branch as seen from the indoor unit.
Maximum
allowable
length
Between outdoor
and indoor units
Between outdoor branch and indoor unit
(Only for RXYQ18 or more)
Between outdoor and indoor units
Between indoor and indoor units
Between outdoor and outdoor units
Actual pipe length
Actual pipe length
Actual pipe length
Difference in height
Difference in height
Difference in height
Equivalent length
Total extension length
Pipe length between outdoor and indoor units ≤ 150m
Example unit 8: a + b + c + d + e + f + g + p ≤ 150m
Example unit 8: b + c + d + e + f + g + p ≤ 40m
Equivalent pipe length between outdoor and indoor units ≤ 175m (assume equivalent pipe length of refnet joint to be 0.5m, that of refnet header to be 1m, calculation purposes)
Piping length from outdoor branch to outdoor unit ≤ 10m Approximately length: max 13m
Difference in height between outdoor and indoor units (H1) ≤ 50m (Max 40m if the outdoor unit is below)
Difference in height between adjacent indoor units (H2) ≤ 15m
Difference in height between outdoor unit (main) and outdoor unit (sub) (H3) ≤ 5m
Pipe length from first refrigerant branch kit (either refnet joint or refnet header ) to indoor unit
≤ 40m
Total piping length from outdoor unit* to all indoor units ≤ 300m
Allowable
height
length
Allowable length after the branch
Refrigerant branch kit selection
Pipe size selection
Example unit 8: a + i ≤ 150m
Example unit 6: a + b + h ≤ 150m, unit 8: a + i + k ≤ 150m
Example unit 8: i ≤ 40m
Example unit 6: b + h ≤ 40m, unit 8: i + k ≤ 40m
r
t
s
Outdoor unit
r ≤ 10m (Equivalent length: max 13m)
s ≤ 10m (Equivalent length: max 13m)
t ≤ 10m (Equivalent length: max 13m)
Refrigerant branch kits can only be
used with R-410A.
How to select the REFNET joint
First branch after the outdoor unit has to be selected
from "Outdoor unit capacity type" table. Even if it is
contradictory to the "indoor capacity index" table.
• When using REFNET joints at the first branch counted from the outdoor unit side.
Choose from the following table in accordance with the capacity of the outdoor unit.
Piping between outdoor unit and refrigerant branch kit (part A)
• Match to the size of the connection piping on the outdoor unit. Outdoor unit connection piping size
Piping between refrigerant branch kits
• Choose from the following table in accordance with the total capacity of all the
indoor units connected below this.
• Do not let the connection piping exceed the refrigerant piping size chosen
by general system model name.
For an outdoor unit multi installation (RXYQ18~48MY1B), make the settings in accordance with the
following figure.
How to calculate the additional refrigerant
to be charged
If a negative result is gotten for R from the formula at right, no refrigerant
needs to be added.
Additional refrigerant to be charged R (Kg)
R should be rounded off in units of 0.1Kg.
Piping between outdoor branch
and outdoor unit (part C)
Oil-equalizing line (part D)
Piping between outdoor branches (part B)
Piping between outdoor unit and refrigerant
branch kit (part A)
RX(Y)Q5
RX(Y)Q8, 10
RXYQ12~22
RXYQ24~
KHRQ22M20T7
KHRQ22M29T7
KHRQ22M64T7
KHRQ22M75T7
• For refnet joints other than the first branch, select the proper branch kit model based on the total capacity index.
< 200
200 ≤ x < 290
290 ≤ x < 640
640 <
KHRQ22M20T7
KHRQ22M29T7
KHRQ22M64T7
KHRQ22M75T7
How to select the REFNET header
• Choose from the following table in accordance with the total capacity of all the indoor units connected below the REFNET head
er.
• Note: 250 type cannot be connected below the REFNET header.
< 200
< 290
290 ≤ x < 640
640 <
KHRQ22M29H7 (Max 8 branches)
KHRQ22M29H7 (Max 8 branches)
KHRQ22M64H7 (Max 8 branches)
KHRQ22M75H7 (Max 8 branches)
How to choose an outdoor branch kit (needed if the outdoor unit capacity type is RXYQ18 or more.)
• Choose from the following table in accordance with the number of outdoor units.
2 units
3 units
BHFQ22M907
BHFQ22M1357
example in case of refnet joint C; indoor units 3 + 4 + 5 + 6 + 7 + 8
example in case of refnet joint B indoor units 7 + 8,
example in case of refnet header; indoor units 1 + 2 + 3 + 4 + 5 + 6
example in the case of refnet header; indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
Example of downstream indoor units
ø9.5
ø12.7
ø15.9
ø19.1
RX(Y)Q5
RX(Y)Q8
RX(Y)Q10
RXYQ12, 14, 16
RXYQ18~22
RXYQ24
RXYQ26~34
RXYQ36~48
ø15.9
ø19.1
ø22.2
ø28.6
ø34.9
ø41.3
ø9.5
ø12.7
ø15.9
ø19.1
< 200
200 ≤ x < 290
290 ≤ x < 420
420 ≤ x < 640
640 ≤ x < 920
920 <
ø15.9
ø22.2
ø28.6
ø34.9
ø41.3
Piping between outdoor branches (part B)
• Choose from the following table in accordance with the total capacity of all the
outdoor units connected above this.
Between refrigerant branch kit and indoor unit
• Pipe size for direct connection to indoor unit must be the same as the
connection size of indoor unit.
ø6.4
ø9.5
20, 25, 32, 40, 50
63, 80, 100, 125
200
250
ø12.7
ø15.9
ø19.1
ø22.2
Piping between outdoor branch and outdoor unit (part C)
ø12.7
ø9.5
RXYQ8
RXYQ10
RXYQ12, 14, 16
ø19.1
ø22.2
Oil-equalizing line (Only for RXYQ18 or more) (part D)
ø6.4
Piping size
ø15.9
ø19.1
< 22HP
24HP
26HP <
ø28.6
ø34.9
(Unit:mm)
(Unit:mm)
(Unit: mm)
(Unit: mm)
(Unit: mm)
(Unit: mm)
R =
+
+
+
+
+ _
If the outdoor unit is
RXYQ34MY1B and the
piping lengths are as at
right
R = 30 x 0.25 + 10 x 0.17 + 10 x 0.11 + 40 x 0.054 + 49 x 0.022 - 6 = 7.538
ba c+d+e+f g+h+j+ki
7.5
Total length (m)
of liquid piping
size at ø22.2
x 0.35
Total length (m)
of liquid piping
size at ø19.1
x 0.25
Total length (m)
of liquid piping
size at ø15.9
x 0.17
Total length (m)
of liquid piping
size at ø12.7
x 0.11
Total length (m)
of liquid piping
size at ø9.5
x 0.054
Total length (m)
of liquid piping
size at ø6.4
x 0.022
Model name
RXYQ5~16MY1B
RXYQ18~32MY1B
RXYQ34~48MY1B
0 kg
3 kg
6 kg
Amount of refrigerant
Example for refrigerant branch using refnet joint and refnet header for RXYQ34MY1B
ø28.6
NOTE
Branch with REFNET joint
Branch with REFNET joint and REFNET header
Branch with REFNET header
AB
AB
Outdoor unit capacity type
REFNET joints
Indoor capacity index
REFNET headers
Number of outdoor units Outdoor unit multi piping connection kit
REFNET joints
Indoor capacity index
Outdoor unit capacity type
indoor capacity index
outdoor capacity index
Piping size
Piping size
Piping size
Gas pipe Liquid pipe
Gas pipe Liquid pipe
indoor capacity index
Piping size
Gas pipe Liquid pipe
Gas pipe Liquid pipe
outdoor capacity index
Piping size
Gas pipe Liquid pipe
a: ø19.1 x 30m d: ø9.5 x 10m g: ø6.4 x 10m
j : ø6.4 x 10m
b: ø15.9 x 10m e: ø9.5 x 10m h: ø6.4 x 20m k: ø6.4 x19m
c: ø9.5 x 10m f : ø9.5 x 10m i : ø12.7 x 10m
NOTE
Maximum piping stretch > 90m equivalent:
Increase diameter of the MAIN liquid pipe AND gas pipe, BUT:
• increase only gas for RX(Y)Q5M • increase only liquid for RXYQ12,14,24,36,38,40,42,44,46,48M
ø 9.5
ø 12.7
ø 15.9
ø 19.1
ø 12.7
ø 15.9
ø 19.1
ø 22.2
RXYQ8, 10
RXYQ12, 14, 16
RXYQ18~24
RXYQ26~48
(Unit:mm)
Main liquid pipe size
Outdoor unit
capacity type
Piping size
Nomal size Size up

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